A194779 - OEIS

A194779

Number of lower triangles of a (2n-1)X(2n-1) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor

%I #6 Mar 31 2012 12:36:22

%S 1,7,43,268,1740,11862,85013,639760,5045610,41615165,358185399,

%T 3210667490,29914284833,289187621900,2895861006415

%N Number of lower triangles of a (2n-1)X(2n-1) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor

%C Row 1 of A194778

%e All solutions for n=2 containing a 2

%e ..0

%e ..1.1

%e ..1.1.2

%K nonn

%O 1,2

%A _R. H. Hardin_ Sep 02 2011